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Caption: Galileo IOV satellite launch. Artwork of two in-orbit validation (IOV) Galileo satellites (rectangles) being ejected from their Fregat launcher. These are test satellites for the European Space Agency's Galileo navigation system. Galileo will consist of 30 satellites orbiting over 23,000 kilometres above the Earth, transmitting data for position (longitude and latitude) and height above sea level (elevation). Four IOV satellites will be launched, two in October 2011 and two in 2012. They will validate the design of the satellites and the ground segments of the network.